KVM: VMX: Properly return error to userspace on vmentry failure
[linux-2.6.git] / mm / madvise.c
index 6ca34f0..319528b 100644 (file)
@@ -9,6 +9,7 @@
 #include <linux/pagemap.h>
 #include <linux/syscalls.h>
 #include <linux/mempolicy.h>
+#include <linux/page-isolation.h>
 #include <linux/hugetlb.h>
 #include <linux/sched.h>
 #include <linux/ksm.h>
@@ -222,7 +223,7 @@ static long madvise_remove(struct vm_area_struct *vma,
 /*
  * Error injection support for memory error handling.
  */
-static int madvise_hwpoison(unsigned long start, unsigned long end)
+static int madvise_hwpoison(int bhv, unsigned long start, unsigned long end)
 {
        int ret = 0;
 
@@ -230,10 +231,17 @@ static int madvise_hwpoison(unsigned long start, unsigned long end)
                return -EPERM;
        for (; start < end; start += PAGE_SIZE) {
                struct page *p;
-               int ret = get_user_pages(current, current->mm, start, 1,
-                                               0, 0, &p, NULL);
+               int ret = get_user_pages_fast(start, 1, 0, &p);
                if (ret != 1)
                        return ret;
+               if (bhv == MADV_SOFT_OFFLINE) {
+                       printk(KERN_INFO "Soft offlining page %lx at %lx\n",
+                               page_to_pfn(p), start);
+                       ret = soft_offline_page(p, MF_COUNT_INCREASED);
+                       if (ret)
+                               break;
+                       continue;
+               }
                printk(KERN_INFO "Injecting memory failure for page %lx at %lx\n",
                       page_to_pfn(p), start);
                /* Ignore return value for now */
@@ -334,8 +342,8 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
        size_t len;
 
 #ifdef CONFIG_MEMORY_FAILURE
-       if (behavior == MADV_HWPOISON)
-               return madvise_hwpoison(start, start+len_in);
+       if (behavior == MADV_HWPOISON || behavior == MADV_SOFT_OFFLINE)
+               return madvise_hwpoison(behavior, start, start+len_in);
 #endif
        if (!madvise_behavior_valid(behavior))
                return error;